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  <title>Retrieves a list of foreign keys</title>
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  <div id="layout-content"><div id="function.odbc-foreignkeys" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">odbc_foreignkeys</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">odbc_foreignkeys</span> &mdash; <span class="dc-title">Retrieves a list of foreign keys</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.odbc-foreignkeys-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>odbc_foreignkeys</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection_id</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$pk_qualifier</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$pk_owner</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$pk_table</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$fk_qualifier</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$fk_owner</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$fk_table</code></span>
   ) : <span class="type">resource</span></div>

  <p class="para rdfs-comment">
   Retrieves a list of foreign keys in the specified table or a list of
   foreign keys in other tables that refer to the primary key in the
   specified table
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.odbc-foreignkeys-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">connection_id</code></dt>

     <dd>

      <p class="para">ODBC 连接标识符，详见
<span class="function"><a href="odbc_connect.html" class="function">odbc_connect()</a></span>。</p>
     </dd>

    
    
     <dt>
<code class="parameter">pk_qualifier</code></dt>

     <dd>

      <p class="para">
       The primary key qualifier.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">pk_owner</code></dt>

     <dd>

      <p class="para">
       The primary key owner.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">pk_table</code></dt>

     <dd>

      <p class="para">
       The primary key table.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">fk_qualifier</code></dt>

     <dd>

      <p class="para">
       The foreign key qualifier.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">fk_owner</code></dt>

     <dd>

      <p class="para">
       The foreign key owner.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">fk_table</code></dt>

     <dd>

      <p class="para">
       The foreign key table.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.odbc-foreignkeys-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns an ODBC result identifier 或者在失败时返回 <strong><code>FALSE</code></strong>.
  </p>
  <p class="para">
   The result set has the following columns:
   <ul class="itemizedlist">
    <li class="listitem"><span class="simpara">PKTABLE_QUALIFIER</span></li>
    <li class="listitem"><span class="simpara">PKTABLE_OWNER</span></li>
    <li class="listitem"><span class="simpara">PKTABLE_NAME</span></li>
    <li class="listitem"><span class="simpara">PKCOLUMN_NAME</span></li>
    <li class="listitem"><span class="simpara">FKTABLE_QUALIFIER</span></li>
    <li class="listitem"><span class="simpara">FKTABLE_OWNER</span></li>
    <li class="listitem"><span class="simpara">FKTABLE_NAME</span></li>
    <li class="listitem"><span class="simpara">FKCOLUMN_NAME</span></li>
    <li class="listitem"><span class="simpara">KEY_SEQ</span></li>
    <li class="listitem"><span class="simpara">UPDATE_RULE</span></li>
    <li class="listitem"><span class="simpara">DELETE_RULE</span></li>
    <li class="listitem"><span class="simpara">FK_NAME</span></li>
    <li class="listitem"><span class="simpara">PK_NAME</span></li>
   </ul>
  </p>
  <p class="simpara">
   If <code class="parameter">pk_table</code> contains a table name,
   <span class="function"><strong>odbc_foreignkeys()</strong></span> returns a result set
   containing the primary key of the specified table and all of the
   foreign keys that refer to it.
  </p>
  <p class="simpara">
   If <code class="parameter">fk_table</code> contains a table name,
   <span class="function"><strong>odbc_foreignkeys()</strong></span> returns a result set
   containing all of the foreign keys in the specified table and the
   primary keys (in other tables) to which they refer.
  </p>
  <p class="simpara">
   If both <code class="parameter">pk_table</code> and
   <code class="parameter">fk_table</code> contain table names,
   <span class="function"><strong>odbc_foreignkeys()</strong></span> returns the foreign keys in
   the table specified in <code class="parameter">fk_table</code> that refer
   to the primary key of the table specified in
   <code class="parameter">pk_table</code>. This should be one key at most.
  </p>
 </div>


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